I never realized in depth the difference between a Linux subscription and a license. Linux is open source, so the software itself is for free. No license to use it is required. But when you buy a Linux support subscription, you are legally entitled to download the ISO images of […]
This post is intended to be a dummy guide, best practices, or whatever you call it… about setting up a network while working with virtual boxes on a desk- or laptop. I was setting up a virtual box environment with several Virtual Boxes on my laptop, and as I’m not […]
This post has already been published in the past on the AMIS-blog.
To build an Oracle 12C RAC database – on Virtual Boxes – there’s […]
The second and final post about an issue with a RAC-configuration with two SAN's. Problem was a i/o-freeze of minutes when crashing one of the two SAN's. The first post I ended with a 'cliffhanger' because we had a solution, but not tested it yet.
With this setup we are facing the issue that if we loose a complete SAN, the IO’s to the ASM diskgroups will be blocked for approx 3 till 4 minutes. Oracle does not like this. After 70 seconds after a freeze, rdbms is starting to reboot (expected behaviour).
Red Hat 6 has been there a while, so what about certification with Oracle? Nothing on the Oracle support site, no press releases (maybe I missed one..). But Red Hat finally gave the answer in her Red Hat news - blog
The metric 'swap utilisation (%)' on the node where Grid Control resides, shows permanently a very hig value. Red Hat Linux, 64-bits, 32GB RAM, 4GB swap. Adding 4GB to the swap-file solved the problem.